Hair Particles not updating in Viewport when using image sequence textures to drive Hair Size #65889

New Issue

Jake Odgers · 2019-06-17T17:59:03+02:00

Jake Odgers commented

2019-06-17 17:59:03 +02:00

System Information
Operating system: Darwin-16.7.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon R9 M295X OpenGL Engine ATI Technologies Inc. 4.1 ATI-1.51.8

Blender Version
Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-16 23:08, hash: 12da679fa0
Worked: (optional)

Short description of error
I used dynamic paint to create an image sequence texture, which I was using as a mask to drive hair growth size from the particle system. If I do it this way, things render out correctly, but I cannot see any hair particles inside the viewport, so its impossible to check my work before I render.

Exact steps for others to reproduce the error

Create Plane and Cube, animate cube across plane
Set Cube to Brush, Plane to Canvas with Dynamic Paint
Brush Paint color White, canvas material Black
Set canvas format to image sequence and bake it out
Create hair particle system on Plane
New Texture for Particle system, import create image sequence
Set texture to drive size only

 Now, if you change any of the hair settings, you cannot see the hair in the viewport and can only see upon export.

**System Information** Operating system: Darwin-16.7.0-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon R9 M295X OpenGL Engine ATI Technologies Inc. 4.1 ATI-1.51.8 **Blender Version** Broken: version: 2.80 (sub 74), branch: blender2.7, commit date: 2019-06-16 23:08, hash: `12da679fa0` Worked: (optional) **Short description of error** I used dynamic paint to create an image sequence texture, which I was using as a mask to drive hair growth size from the particle system. If I do it this way, things render out correctly, but I cannot see any hair particles inside the viewport, so its impossible to check my work before I render. **Exact steps for others to reproduce the error** - Create Plane and Cube, animate cube across plane - Set Cube to Brush, Plane to Canvas with Dynamic Paint - Brush Paint color White, canvas material Black - Set canvas format to image sequence and bake it out - Create hair particle system on Plane - New Texture for Particle system, import create image sequence - Set texture to drive size only ``` Now, if you change any of the hair settings, you cannot see the hair in the viewport and can only see upon export. ```

Jake Odgers commented

2019-06-17 17:59:03 +02:00

Added subscriber: @jakeodgers

blender-admin commented

2019-06-17 17:59:03 +02:00

#76251 was marked as duplicate of this issue

Addison commented

2019-06-17 22:37:23 +02:00

Added subscriber: @seaside98-4

Addison commented

2019-06-17 22:37:23 +02:00

This seems like a pretty long process to reproduce, can you attach a blend file demonstrating the issue?

Philipp Oeser commented

2019-06-18 10:54:04 +02:00

Added subscriber: @lichtwerk

Philipp Oeser self-assigned this 2019-06-18 10:54:04 +02:00

Philipp Oeser commented

2019-06-18 10:54:04 +02:00

This is reproducable with any image sequence mapped to ParticleSettings influence [no update on framechange there]
Checking...

This is reproducable with any image sequence mapped to ParticleSettings influence [no update on framechange there] Checking...

Philipp Oeser commented

2019-06-18 14:07:45 +02:00

Testfile [including image sequence]:
#65889.zip

Pretty sure there is a more "correct" way of solving this, but I added following relations [in case image is a sequence]

timesource -> texture (cow)
texture (cow) --> particle settings eval
[only got it to work using NodeType::COPY_ON_WRITE -- as I said this might be wrong, but otherwise I couldnt get the updates to show... see D5088]

Testfile [including image sequence]: [#65889.zip](https://archive.blender.org/developer/F7132146/T65889.zip) Pretty sure there is a more "correct" way of solving this, but I added following relations [in case image is a sequence] - timesource -> texture (cow) - texture (cow) --> particle settings eval [only got it to work using `NodeType::COPY_ON_WRITE` -- as I said this might be wrong, but otherwise I couldnt get the updates to show... see [D5088](https://archive.blender.org/developer/D5088)]

Philipp Oeser was unassigned by Dalai Felinto

2019-12-23 16:34:05 +01:00

Ankit Meel commented

2020-04-30 10:19:54 +02:00

Added subscriber: @lrevardel

Luc Revardel commented

2020-04-30 15:33:19 +02:00

I think we should make it clear in the title that this issue is related to "image sequence texture" as shown in the attached blend file. It will avoid confusion with other issues raised on fixed-image textures or procedural textures used as particles influencer (as they seem technically unrelated).

Philipp Oeser changed title from ~~Hair Particles not updating in Viewport when using Textures to drive Hair Size~~ to Hair Particles not updating in Viewport when using image sequence textures to drive Hair Size

2020-04-30 17:15:57 +02:00

blender-admin commented

2020-05-28 10:46:04 +02:00

This issue was referenced by 1335f2d272

This issue was referenced by 1335f2d27221bed10a5ab74a06fdc96e6a8e4bb9

Sergey Sharybin commented

2020-05-28 10:59:45 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Sergey Sharybin closed this issue

2020-05-28 10:59:45 +02:00

Sergey Sharybin self-assigned this 2020-05-28 10:59:45 +02:00

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Hair Particles not updating in Viewport when using image sequence textures to drive Hair Size #65889